Between Mikhail Kravchuk and Efim Zelmanov who wrote more articles on mathematics? 
Mykhailo Pylypovych Kravchuk
-1
Section::::Abstract.
Mikhail Kravchuk
3033888
-1
Section::::Abstract.
Efim Zelmanov
1104849
-1
Section::::Abstract.
Efim Zelmanov
1104849